稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
7期
648-654
,共7页
吕东显%郭翠萍%李长荣%杜振民
呂東顯%郭翠萍%李長榮%杜振民
려동현%곽취평%리장영%두진민
Sn-Y system%Mg-Sn-Y system%CALPHAD technique%thermodynamic parameters%rare earths
The thermodynamic optimization of the Sn-Y and Mg-Sn-Y systems was critically carried out by means of the CALPHAD (CALculation of PHAse Diagram) technique. In the Sn-Y system, the solution phases (liquid, bcc, bct and hcp) were described by the substitutional solution model. The compound Sn3Y5, which has a homogeneity range, was treated as the formula (Sn, Y)3(Sn, Y)2Y3 by a three-sublattice model in accordance with the site occupancies. In the Mg-Sn-Y system, the liquid phase was treated as the for-mula (Mg, Sn, Y, Mg2Sn) using an associated solution model, and bcc, bct and hcp were treated as the formula (Mg, Sn, Y). The compound Sn3Y5 was treated as the formula (Sn, Y, Mg)3(Sn, Y, Mg)2Y3. The ternary compound MgSnY was treated as stoichiomet-ric compound. A set of self-consistent thermodynamic parameters of the Mg-Sn-Y system was obtained. The projection of the liq-uidus surfaces and the reaction scheme of the Mg-Sn-Y system were predicted.
